Influence of misfit stress on the magnetoresistive properties of La0.7Ca0.3MnO3−δ thin films
Influence of misfit stress on the magnetoresistive properties of La0.7Ca0.3MnO3−δ thin films
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DOI：
10.1063/1.369961
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发表时间：
1999-04
影响因子：
3.2
通讯作者：
E. Gommert;H. Cerva;J. Wecker;K. Samwer
中科院分区：
文献类型：
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作者：
E. Gommert;H. Cerva;J. Wecker;K. Samwer
For this study La0.7Ca0.3MnO3−δ (LCMO) films of various thicknesses were deposited on SrTiO3(100), LaAlO3(100), and MgO(100) substrates. The substrate–film lattice mismatch causes changes in the microstructure of the films and can therefore influence their magnetoresistive behavior. The structure of the films was characterized by x-ray diffraction and high-resolution transmission electron microscopy. Magnetic and electric properties were determined using standard techniques. Samples grown on SrTiO3 show a strongly distorted growth. A large number of defects are incorporated in the initial LCMO layers. Beginning at a thickness of approximately 500 nm films on these substrates show strong deviations in electric behavior and develop macroscopic cracks. In the case of LaAlO3 substrates the films show only a few lattice defects. The substrate–film lattice mismatch is compensated by large stresses in the LCMO films. The best samples with the least amount of defects are grown on MgO substrates even though the su...
